740 L4-2320cc 2.3L DOHC B234F (Can) (1992)
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If there is no engine temperature signal, ignition timing is based on the engine being warm.
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If there is no TP signal, the control module takes account of load when the engine is idling.
Load information
The DI system receives information about load from the MFI control module. When load is high and fuel/air consumption high, the ignition is
retarded. If engine load changes rapidly the ignition is retarded significantly on all cylinders to prevent knocking.
Knock control
If one of the cylinders begins to knock the ignition is retarded for that cylinder until the knocking ceases. When the knocking stops the ignition is
advanced by degrees. The rate of advance is dependent on engine speed. This rate is faster at low engine speeds and slower at high speeds.
Adaptive knock control
If the engine is under heavy load for a long period the ignition will often be retarded by the knock control. To prevent knocking this will cause the
control module to retard the ignition by 10 on all cylinders for as long as the engine is under abnormal load.
High-tension system
The high-tension system consists of the power stage, ignition coil, distributor and spark plugs.
The power stage closes, breaking the power through the ignition coil primary coil. When the primary coil current is interrupted a high-tension voltage
of 30-35 kV is generated in the secondary coil.
This high-tension voltage is transmitted to the distributor.